NAMETAB of table & either does not exist or is inactive

What causes this issue?

Access to the ABAP Dictionary using the ABAP Dictionary interface was
unsuccessful. The nametab of the specified table either could not be
found or has incorrect entries.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

The table was probably not activated. Activation can be carried out
with transaction SE11.

Error message extract from SAP system. Copyright SAP SE.